// 字面量类型应用
// 适用场景：性别、学历、政治面貌...
type Gender = '男' | '女'
let gender: Gender = '男'
gender = '女'

// 思考
let test1 = 'this is a cat'
test1 = 'aaaa'

const test2 = 'this is a cat'

export { gender, test1, test2 }